What role do interlocking systems play at Chelsea and 5th street?

Interlocking systems are crucial in controlling train movements at junctions or crossings where multiple tracks intersect. They ensure that trains can only proceed when it is safe to do so, preventing collisions and ensuring the correct routing of trains to their designated tracks. At Chelsea and 5th Street, interlocking systems allow for the complex management of train paths as trains approach, depart, or pass through the area. This includes coordinating signals and track switches to facilitate safe and efficient operations, effectively managing overall traffic flow on the rail network.

In contrast, while preventing signal failures and managing platform arrivals contributes to overall safety and efficiency in train operations, these functions are not the primary role of interlocking systems. Similarly, the facilitation of ticket sales is unrelated to the operational function of interlocking systems, as it deals primarily with passenger transactions rather than train movement safety and coordination.